What causes milk to go bad?

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What causes milk to go bad?

In: Biology

Milk spoils when bacteria converts the lactose into glucose and galactose, producing lactic acid. Lactic acid creates casein and then forms a curd that can quickly curdle the milk within 24 hours. … When opening milk, there should be no odor whatsoever. Spoiled milk smells sour and even foul. – got this off google, not an expert but it sounds scientific enough for me.